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71 lines
2.0 KiB
71 lines
2.0 KiB
/* -*- mode: C++ ; c-file-style: "stroustrup" -*- ***************************** |
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* Qwt Widget Library |
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* Copyright (C) 1997 Josef Wilgen |
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* Copyright (C) 2002 Uwe Rathmann |
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* |
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* This library is free software; you can redistribute it and/or |
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* modify it under the terms of the Qwt License, Version 1.0 |
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*****************************************************************************/ |
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#ifndef QWT_ABSTRACT_LEGEND_H |
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#define QWT_ABSTRACT_LEGEND_H |
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#include "qwt_global.h" |
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#include "qwt_legend_data.h" |
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#include <qframe.h> |
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#include <qlist.h> |
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class QVariant; |
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/*! |
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\brief Abstract base class for legend widgets |
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Legends, that need to be under control of the QwtPlot layout system |
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need to be derived from QwtAbstractLegend. |
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\note Other type of legends can be implemented by connecting to |
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the QwtPlot::legendDataChanged() signal. But as these legends |
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are unknown to the plot layout system the layout code |
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( on screen and for QwtPlotRenderer ) need to be organized |
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in application code. |
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\sa QwtLegend |
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*/ |
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class QWT_EXPORT QwtAbstractLegend : public QFrame |
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{ |
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Q_OBJECT |
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public: |
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explicit QwtAbstractLegend( QWidget *parent = NULL ); |
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virtual ~QwtAbstractLegend(); |
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/*! |
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Render the legend into a given rectangle. |
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\param painter Painter |
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\param rect Bounding rectangle |
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\param fillBackground When true, fill rect with the widget background |
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\sa renderLegend() is used by QwtPlotRenderer |
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*/ |
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virtual void renderLegend( QPainter *painter, |
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const QRectF &rect, bool fillBackground ) const = 0; |
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//! \return True, when no plot item is inserted |
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virtual bool isEmpty() const = 0; |
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virtual int scrollExtent( Qt::Orientation ) const; |
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public Q_SLOTS: |
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/*! |
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\brief Update the entries for a plot item |
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\param itemInfo Info about an item |
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\param data List of legend entry attributes for the item |
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*/ |
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virtual void updateLegend( const QVariant &itemInfo, |
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const QList<QwtLegendData> &data ) = 0; |
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}; |
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#endif
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